could luff
Regular verb: luff - luffed- luffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could luff
you could luff
she could luff
we could luff
you could luff
they could luff 	I could be luffing
you could be luffing
she could be luffing
we could be luffing
you could be luffing
they could be luffing	I could have luffed
you could have luffed
she could have luffed
we could have luffed
you could have luffed
they could have luffed	I could have been luffing
you could have been luffing
she could have been luffing
we could have been luffing
you could have been luffing
they could have been luffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't luff
you couldn't luff
she couldn't luff
we couldn't luff
you couldn't luff
they couldn't luff 	I couldn't be luffing
you couldn't be luffing
she couldn't be luffing
we couldn't be luffing
you couldn't be luffing
they couldn't be luffing	I couldn't have luffed
you couldn't have luffed
she couldn't have luffed
we couldn't have luffed
you couldn't have luffed
they couldn't have luffed	I couldn't have been luffing
you couldn't have been luffing
she couldn't have been luffing
we couldn't have been luffing
you couldn't have been luffing
they couldn't have been luffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I luff?
could you luff?
could she luff?
could we luff?
could you luff?
could they luff? 	could I be luffing?
could you be luffing?
could she be luffing?
could we be luffing?
could you be luffing?
could they be luffing? 	could I have luffed?
could you have luffed?
could she have luffed?
could we have luffed?
could you have luffed?
could they have luffed? 	could I have been luffing?
could you have been luffing?
could she have been luffing?
could we have been luffing?
could you have been luffing?
could they have been luffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I luff?
couldn't you luff?
couldn't she luff?
couldn't we luff?
couldn't you luff?
couldn't they luff? 	couldn't I be luffing?
couldn't you be luffing?
couldn't she be luffing?
couldn't we be luffing?
couldn't you be luffing?
couldn't they be luffing? 	couldn't I have luffed?
couldn't you have luffed?
couldn't she have luffed?
couldn't we have luffed?
couldn't you have luffed?
couldn't they have luffed? 	couldn't I have been luffing?
couldn't you have been luffing?
couldn't she have been luffing?
couldn't we have been luffing?
couldn't you have been luffing?
couldn't they have been luffing?